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Annotation of OpenXM_contrib/gmp/mpz/inp_raw.c, Revision 1.1

1.1     ! maekawa     1: /* mpz_inp_raw -- Input a mpz_t in raw, but endianess, and wordsize
        !             2:    independent format (as output by mpz_out_raw).
        !             3:
        !             4: Copyright (C) 1991, 1993, 1994, 1995 Free Software Foundation, Inc.
        !             5:
        !             6: This file is part of the GNU MP Library.
        !             7:
        !             8: The GNU MP Library is free software; you can redistribute it and/or modify
        !             9: it under the terms of the GNU Library General Public License as published by
        !            10: the Free Software Foundation; either version 2 of the License, or (at your
        !            11: option) any later version.
        !            12:
        !            13: The GNU MP Library is distributed in the hope that it will be useful, but
        !            14: WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
        !            15: or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
        !            16: License for more details.
        !            17:
        !            18: You should have received a copy of the GNU Library General Public License
        !            19: along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
        !            20: the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
        !            21: MA 02111-1307, USA. */
        !            22:
        !            23: #include <stdio.h>
        !            24:
        !            25: #include "gmp.h"
        !            26: #include "gmp-impl.h"
        !            27:
        !            28: size_t
        !            29: #if __STDC__
        !            30: mpz_inp_raw (mpz_ptr x, FILE *stream)
        !            31: #else
        !            32: mpz_inp_raw (x, stream)
        !            33:      mpz_ptr x;
        !            34:      FILE *stream;
        !            35: #endif
        !            36: {
        !            37:   int i;
        !            38:   mp_size_t s;
        !            39:   mp_size_t xsize;
        !            40:   mp_ptr xp;
        !            41:   unsigned int c;
        !            42:   mp_limb_t x_limb;
        !            43:   mp_size_t in_bytesize;
        !            44:   int neg_flag;
        !            45:
        !            46:   if (stream == 0)
        !            47:     stream = stdin;
        !            48:
        !            49:   /* Read 4-byte size */
        !            50:   in_bytesize = 0;
        !            51:   for (i = 4 - 1; i >= 0; i--)
        !            52:     {
        !            53:       c = fgetc (stream);
        !            54:       in_bytesize = (in_bytesize << BITS_PER_CHAR) | c;
        !            55:     }
        !            56:
        !            57:   /* Size is stored as a 32 bit word; sign extend in_bytesize for non-32 bit
        !            58:      machines.  */
        !            59:   if (sizeof (mp_size_t) > 4)
        !            60:     in_bytesize |= (-(in_bytesize < 0)) << 31;
        !            61:
        !            62:   neg_flag = in_bytesize < 0;
        !            63:   in_bytesize = ABS (in_bytesize);
        !            64:   xsize = (in_bytesize + BYTES_PER_MP_LIMB - 1) / BYTES_PER_MP_LIMB;
        !            65:
        !            66:   if (xsize == 0)
        !            67:     {
        !            68:       x->_mp_size = 0;
        !            69:       return 4;                        /* we've read 4 bytes */
        !            70:     }
        !            71:
        !            72:   if (x->_mp_alloc < xsize)
        !            73:     _mpz_realloc (x, xsize);
        !            74:   xp = x->_mp_d;
        !            75:
        !            76:   x_limb = 0;
        !            77:   for (i = (in_bytesize - 1) % BYTES_PER_MP_LIMB; i >= 0; i--)
        !            78:     {
        !            79:       c = fgetc (stream);
        !            80:       x_limb = (x_limb << BITS_PER_CHAR) | c;
        !            81:     }
        !            82:   xp[xsize - 1] = x_limb;
        !            83:
        !            84:   for (s = xsize - 2; s >= 0; s--)
        !            85:     {
        !            86:       x_limb = 0;
        !            87:       for (i = BYTES_PER_MP_LIMB - 1; i >= 0; i--)
        !            88:        {
        !            89:          c = fgetc (stream);
        !            90:          x_limb = (x_limb << BITS_PER_CHAR) | c;
        !            91:        }
        !            92:       xp[s] = x_limb;
        !            93:     }
        !            94:
        !            95:   if (c == EOF)
        !            96:     return 0;                  /* error */
        !            97:
        !            98:   MPN_NORMALIZE (xp, xsize);
        !            99:   x->_mp_size = neg_flag ? -xsize : xsize;
        !           100:   return in_bytesize + 4;
        !           101: }